usr/src/lib/libcurses/screen/wmoveprevch.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1988 by Sun Microsystems, Inc.
  24  */
  25
  26 #pragma ident   "%Z%%M% %I%     %E% SMI"
  27
  28 /*LINTLIBRARY*/
  29
  30 #include        <sys/types.h>
  31 #include        "curses_inc.h"
  32
  33 int
  34 wmoveprevch(WINDOW *win)
  35 /*
  36  * wmoveprevch --- moves the cursor back to the previous char of char
  37  * cursor is currently on.  This is used to move back over a multi-column
  38  * character.  When the cursor is on a character at the left-most
  39  * column, the cursor will stay there.
  40  */
  41 {
  42         chtype  *_yy;
  43         short   x;
  44
  45         (void) wadjcurspos(win);
  46         x = win->_curx;
  47         if (x == 0) /* Can't back up any more. */
  48                 return (ERR);
  49         _yy = win->_y[win->_cury];
  50         --x;
  51         while ((x > 0) && (ISCBIT(_yy[x])))
  52                 --x;
  53         win->_curx = x;
  54         win->_flags |= _WINMOVED;
  55         return (win->_immed ? wrefresh(win): OK);
  56 }